My sons eyes seem to flicker sometimes?

I sometimes notice that when my son is looking at me and smiling his eyes flicker, like they’re shaking a bit. What could this be?

He was born 5 weeks early and at 6 weeks when he started to really look at me one of his eyes didn't seem to be looking fully at me but then he just started to focus superior and now it's fine but the flickering is weired.
Physicians at the time said his eyes were fine but now im worried cause of this new thing. Has this happened to anyone Else's baby and their child was fine.
He is now 12 weeks old.

---

Answer:
any flicker in eyes is called nystagmus. this just means that there’s involuntary movements of the eye. I dont mean to worry you but often this normal and nothing to worry about but sometimes it is caused by neurological problems. please take your son to a doctor or optician asap for an examination. even if it is nothing in the end alteast your mind will be as rest

all the ideal